An advanced ISO-FLUX equilibrium control scheme is developed and implemented in the JT-60SA equilibrium controller. For future fusion reactor, the VDE control by the active superconducting coils is essential due to the absence of in-vessel coils and stabilization plates, and the presence of large gap between plasmas and vacuum vessels with the tritium breeding blanket. Under the circumstances, the equilibrium controller should achieve plasma position/shape control and plasma current control by superconducting coils within limited power supply voltages, where plasma current control affects plasma position/shape control, and vice versa. The newly developed ISO-FLUX control scheme enhances the controllability under the above hybrid control of position/shape and plasma current circumstances. Furthermore, the new scheme also provides good controllability under large eddy currents conditions, which will also be expected in future superconducting tokamaks, such as JT-60SA, ITER, and DEMO due to its large inductance and high target plasma current. The JT-60SA equilibrium controller with the developed scheme is well verified by a magnetohydrodynamic equilibrium control simulator ‘MECS’ and ready for the integrated commissioning of JT-60SA.

在 JT-60SA 平衡控制器中开发并实施了先进的 ISO-FLUX 平衡控制方案。对于未来的聚变反应堆，由于没有容器内线圈和稳定板，并且等离子体和真空容器与氚增殖层之间存在大间隙，因此有源超导线圈的 VDE 控制是必不可少的。在这种情况下，平衡控制器应在有限的电源电压范围内通过超导线圈实现等离子体位置/形状控制和等离子体电流控制，其中等离子体电流控制影响等离子体位置/形状控制，反之亦然。新开发的ISO-FLUX控制方案增强了上述位置/形状和等离子体电流混合控制下的可控性。此外，新方案在大涡流条件下也提供了良好的可控性，由于其大电感和高目标等离子体电流，这也将在未来的超导托卡马克，如JT-60SA、ITER和DEMO中得到预期。具有开发方案的 JT-60SA 平衡控制器通过磁流体动力平衡控制模拟器“MECS”进行了很好的验证，并为 JT-60SA 的集成调试做好了准备。